Steam iron



FIG. 1 is a front elevational view of a steam iron showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines in the drawings illustrate the portions of the design that form no part of the claim. 

The ornamental design for a steam iron, as shown. 